International Journal of Engineering Research-Online A Peer Reviewed International Journal Articles available online http://www.ijoer.in Vol.2., Issue.6, 2014 233 MAJAHAR HUSSAIN MAHAMMAD & SHAIK MOHAMMAD IRSHAD A Three Phase Three Wire DSTATCOM for Improvement of Power Quality Using Advanced Control Strategy MAJAHAR HUSSAIN MAHAMMAD* 1 , SHAIK MOHAMMAD IRSHAD 2 1&2 Lecturer, College of Engineering, King Khalid University SARANYA.K INTRODUCTION The transportation of clean power has been always an important task for utilities. In the past the simplicity of the power systems with almost all the important loads pure linear was an easy job, now days the fastest growth of technology low power and high power semiconductors (e.g. diodes, thyristors, Transistors) and the implementation of this technology in domestic and industrial applications as motor drives and renewable energy sources become the transmission of clean power through the systems a really big deal, especially in distribution systems. In recent years, there has been an increased use of non-linear loads which has resulted in an increased fraction of non-sinusoidal currents and voltages in electric network [1]. Classification of power quality areas may be made according to the source of the problem such as converters, magnetic circuit non linearity, arc furnace or by the wave shape of the signal such as harmonics, flicker or by the frequency spectrum (radio frequency interference). The waveform of RESEARCH ARTICLE ISSN: 2321-7758 Article Received: 17/12/2014 Article Revised on: 27/12/2014 Article Accepted on:30/12/2014 ABSTRACT Variable speed drives (VSD) consists of various motors are widely used in the industrials and process control in the form of varied applications such as fans, compressors, pumps etc. However, they inject high harmonic content into current dƌaǁŶ fƌoŵ the aĐ sLJsteŵ at PCC poǁeƌ ĐaŶ’t ďe ŵaiŶtaiŶed as a ƋualitLJ. Power quality problems such as harmonics, reactive power, power factor and so on, have become serious increasingly, passive power filter may not provide better solution and the development of active compensator has been one of the ways to solve these problems. This paper presents a three-phase, 3-level voltage source inverter based DSTATCOM for power line conditioning to improve power quality in the distribution network. Static device compensates both reactive power and harmonic currents drawn by non-linear loads; additionally it facilitates power factor corrections. The compensation process is based on concept of p-q theory as well as unit vector control strategy. This paper deals with the application of a DSTATCOM for compensation of such type of loads. The MATLAB / Simulink based models are developed for variable speed drive loads. The analysis is carried out various control strategies application to proposed DSTATCOM and presented the results. Keywords- DSTATCOM (Distributed Static Compensator), Unit Vector Control Strategy, Instantaneous P-Q theory, Power quality, DC Link Controller. ©KY Publications MAJAHAR HUSSAIN MAHAMMAD